Butter stick



FIG. 1 is a top, front and left side perspective view of a butter stick;

FIG. 2 is a top plan view thereof, the bottom plan view being a mirror image thereof;

FIG. 3 is a is a front elevation view thereof, the bottom plan view being a mirror image thereof; and,

FIG. 4 is a left side elevation view, the right side elevation view being a mirror image thereof.

The evenly-spaced broken lines in FIGS. 1-4 illustrate portions of the butter stick that form no part of the claimed design. The dot-dash broken lines in FIGS. 1-3 illustrate the boundary of the claimed design which forms no part thereof. Any portion of the article between those breaks forms no part of the claimed design. 

CLAIM The ornamental design for a butter stick, as shown and described. 